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iommu/dma: Respect IOMMU aperture when allocating

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commit c987ff0d3c upstream.

Where a device driver has set a 64-bit DMA mask to indicate the absence
of addressing limitations, we still need to ensure that we don't
allocate IOVAs beyond the actual input size of the IOMMU. The reported
aperture is the most reliable way we have of inferring that input
address size, so use that to enforce a hard upper limit where available.

Fixes: 0db2e5d18f ("iommu: Implement common IOMMU ops for DMA mapping")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Murphy
2016-08-09 17:31:35 +01:00
committed by Greg Kroah-Hartman
parent 2251a2e560
commit e53eb1b8c9
1 changed files with 7 additions and 4 deletions
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11
drivers/iommu/dma-iommu.c
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@ -152,12 +152,15 @@ int dma_direction_to_prot(enum dma_data_direction dir, bool coherent)
}
}
static struct iova *__alloc_iova(struct iova_domain *iovad, size_t size,
static struct iova *__alloc_iova(struct iommu_domain *domain, size_t size,
dma_addr_t dma_limit)
{
struct iova_domain *iovad = domain->iova_cookie;
unsigned long shift = iova_shift(iovad);
unsigned long length = iova_align(iovad, size) >> shift;
if (domain->geometry.force_aperture)
dma_limit = min(dma_limit, domain->geometry.aperture_end);
/*
* Enforce size-alignment to be safe - there could perhaps be an
* attribute to control this per-device, or at least per-domain...
@ -297,7 +300,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size,
if (!pages)
return NULL;
iova = __alloc_iova(iovad, size, dev->coherent_dma_mask);
iova = __alloc_iova(domain, size, dev->coherent_dma_mask);
if (!iova)
goto out_free_pages;
@ -369,7 +372,7 @@ dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
phys_addr_t phys = page_to_phys(page) + offset;
size_t iova_off = iova_offset(iovad, phys);
size_t len = iova_align(iovad, size + iova_off);
struct iova *iova = __alloc_iova(iovad, len, dma_get_mask(dev));
struct iova *iova = __alloc_iova(domain, len, dma_get_mask(dev));
if (!iova)
return DMA_ERROR_CODE;
@ -483,7 +486,7 @@ int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
prev = s;
}
iova = __alloc_iova(iovad, iova_len, dma_get_mask(dev));
iova = __alloc_iova(domain, iova_len, dma_get_mask(dev));
if (!iova)
goto out_restore_sg;